High-protection screw compressor

Abstract

The utility model discloses a screw compressor with high protection. The screw compressor comprises an air compression assembly, a driving assembly, an air inlet assembly and a variable frequency speed regulation assembly. The driving assembly is arranged on the right side of the air compression assembly, and is provided with a first heat dissipation channel at the top and a second heat dissipation channel at the bottom; the air inlet assembly is mounted on the right side of the driving assembly; the variable-frequency speed regulation assembly is arranged above the driving assembly and comprises a shell and a radiator; the radiator is arranged at the bottom of the shell and is arranged in the second radiating channel; the shell comprises an upper shell, a lower shell, a first sealing step surface and a second sealing step surface; the front ends of the upper shell and the lower shell are connected through a first sealing step surface, and the rear ends are connected through a second sealing step surface; a gap D1 of a first sealing step surface between the upper shell and the lower shell is less than or equal to 1mm; and the gap D2 between the second sealing step surfaces between the upper shell and the lower shell is less than or equal to 1mm. Through the arrangement, the protection capability of the variable-frequency speed regulation assembly of the screw compressor is higher.

Description

Technical Field

[0001] This utility model relates to the field of screw compressor technology, and in particular to a highly protected screw compressor. Background Technology

[0002] Screw air compressors adjust their output power according to changes in air demand during operation. A variable frequency drive (VFD) allows for precise control of the motor speed and flexible adjustment of the compressor's discharge volume, thus meeting air demand under different operating conditions and preventing energy waste or malfunctions caused by excessive or insufficient air supply.

[0003] The operating environment of screw air compressors typically includes oil lubrication and cooling systems. During operation, oil or water spraying may occur from oil pipes or water-containing air pipes. Simultaneously, many on-site environments also contain dust, metal cuttings, and other impurities that can easily enter the variable frequency drive (VFD), further increasing the risk of damage and affecting normal equipment operation. Currently, most VFDs adopt an IP20 protection rating, meaning they offer some protection against solids larger than 12.5mm in diameter. However, their adaptability to harsher industrial applications is poor. Furthermore, current VFDs offer virtually no protection against liquids. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a highly protected screw compressor. The variable frequency drive (VFD) component of this screw compressor achieves an IP54 protection rating, making it suitable for more demanding industrial applications.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A high-protection screw compressor includes: an air compression assembly, a drive assembly, an intake assembly, and a variable frequency drive assembly; the air compression assembly is used to compress input air; the drive assembly is installed on the right side of the air compression assembly and is used to drive the air compression assembly, with a first heat dissipation channel at the top and a second heat dissipation channel at the bottom; the intake assembly is installed on the right side of the drive assembly and communicates with the first and second heat dissipation channels; the variable frequency drive assembly is at least partially installed above the drive assembly and the intake assembly, and includes a housing and a radiator; the radiator is installed at the bottom of the housing and is at least partially disposed in the second heat dissipation channel; the housing includes an upper shell, a lower shell, a first sealing step surface, and a second sealing step surface; the front ends of the upper shell and the lower shell are connected through the first sealing step surface to form a sealing structure; the rear ends of the upper shell and the lower shell are connected through the second sealing step surface to form a sealing structure; the gap D1 between the first sealing step surfaces of the upper shell and the lower shell is less than or equal to 1 mm; the gap D2 between the second sealing step surfaces of the upper shell and the lower shell is less than or equal to 1 mm.

[0007] Furthermore, the drive assembly includes a motor cylinder, a drive motor, a first heat sink, and a second heat sink; the drive motor is at least partially disposed inside the motor cylinder and connected to the air compression assembly; the first heat sink is disposed at the bottom of the motor cylinder, close to the drive motor, and at least partially disposed within a first heat dissipation channel; the second heat sink is disposed at the top of the motor cylinder, close to the drive motor, and at least partially disposed within a second heat dissipation channel.

[0008] Furthermore, the air intake assembly includes a cover, a rotating shaft, and a centrifugal impeller; the cover is installed on the right side of the motor cylinder, and an air inlet is provided at the right end; the centrifugal impeller is at least partially disposed inside the cover; the rotating shaft extends in the left-right direction, connects to the centrifugal impeller, passes through the motor cylinder, and connects to the drive motor; the drive motor can drive the centrifugal impeller to rotate through the rotating shaft; both the first heat dissipation channel and the second heat dissipation channel are connected to the interior of the cover.

[0009] Furthermore, an air guide shroud is provided above the air inlet, and an air guide plate is provided at the bottom of the variable frequency speed control component near the air guide shroud. An air guide channel is formed between the air guide plate and the air guide shroud. Air can flow into the shroud from the air inlet, be guided by the air guide shroud and the air guide plate, and flow into the second heat dissipation channel from the air guide channel.

[0010] Furthermore, the variable frequency speed control component also includes an IGBT module; the IGBT module is at least partially disposed at the bottom of the housing cavity; the heat sink is installed at the bottom of the housing, close to the IGBT module, and is at least partially disposed within the second heat dissipation channel.

[0011] Furthermore, the lower casing is made of plastic, while the IGBT module is made of metal. A hard-soft sealing structure is formed between the lower casing and the IGBT module to prevent moisture and dust from entering the frequency converter from the drive component.

[0012] Furthermore, the rear end of the lower shell is provided with a lead-out module; the lead-out module includes lead-out wires connecting the internal and external circuits of the frequency conversion speed control component and a sealing sleeve covering the lead-out wires; a sealing ring is provided at the connection between the sealing sleeve and the lower shell and is fitted on the sealing sleeve.

[0013] Furthermore, a liquid crystal display driver board is provided on the top of the upper shell, and a display screen film is covered on the liquid crystal display driver board.

[0014] Furthermore, the variable frequency speed control component also includes a rectifier module and an inverter drive PCB board; the inverter drive PCB board is at least partially disposed inside the housing and is connected to the IGBT module through the rectifier module.

[0015] Furthermore, the drive motor includes a first operating speed and a second operating speed; when the variable frequency speed control component is operating under rated load, the drive motor is at the first operating speed; when the load of the air compression component changes, and the operating load of the rectifier module and IGBT module changes accordingly, the variable frequency speed control component controls the drive motor to operate at the second operating speed; the ratio of the difference between the second operating speed and the first operating speed to the change in the operating load of the rectifier module and IGBT module is the change coefficient k.

[0016] The aforementioned high-protection screw compressor has a variable frequency speed control component that forms a sealed housing through an upper shell, a lower shell, a first sealing step surface, and a second sealing step surface. At the same time, the gap between the first sealing step surface and the second sealing step surface is limited to less than or equal to 1 mm, so that the protection level of the variable frequency speed control component can reach IP54, in order to meet more demanding industrial application environments. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of a screw compressor provided according to this utility model;

[0018] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0019] Figure 3 yes Figure 1 A magnified view of a section at point B. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In addition, to clearly illustrate the technical solution of this application, the following are also defined: Figure 1 The top, bottom, left, and right sides are shown.

[0022] like Figure 1 As shown, this application provides a highly protected screw compressor. The screw compressor includes an air compression assembly 11, a drive assembly 12, an intake assembly 15, and a variable frequency speed control assembly 16.

[0023] Specifically, the air compression assembly 11 includes a male rotor 111 and a female rotor that mesh with each other for compressing air. The shafts 152 of both the male rotor 111 and the female rotor extend in the left-right direction.

[0024] A drive assembly 12 is mounted on the right side of the air compression assembly 11 and is used to drive the air compression assembly 11. It includes a motor cylinder 121, a drive motor 122, a first heat sink 123, and a second heat sink 124. The motor cylinder 121 protects the internal components of the drive assembly 12. The drive motor 122 is at least partially disposed within the motor cylinder 121 and connected to the male rotor 111, driving the male rotor 111 to rotate. The motor cylinder 121 has a first heat dissipation channel 13 at its bottom and a second heat dissipation channel 14 at its top. Specifically, the first heat sink 123 is mounted at the bottom of the motor cylinder 121, close to the drive motor 122, and at least partially disposed within the first heat dissipation channel 13. The second heat sink 124 is mounted at the top of the motor cylinder 121, close to the drive motor 122, and at least partially disposed within the second heat dissipation channel 14. The first heat sink 123 and the second heat sink 124 exchange heat with the cold air within the first heat dissipation channel 13 and the second heat dissipation channel 14 to dissipate heat from the stator heating elements within the drive motor 122.

[0025] The air intake assembly 15 includes a cover 151, a rotating shaft 152, and a centrifugal impeller 153. The cover 151 is installed on the right side of the motor cylinder 121, and an air inlet 154 is provided at the right end. The centrifugal impeller 153 is at least partially disposed inside the cover 151. The rotating shaft 152 extends in the left-right direction, connects to the centrifugal impeller 153, passes through the motor cylinder 121, and connects to the drive motor 122. The first heat dissipation channel 13 and the second heat dissipation channel 14 are both in communication with the interior of the cover 151. The drive motor 122 can drive the centrifugal impeller 153 to rotate through the rotating shaft 152, forming airflow and air pressure inside the cover 151, so that external cold air can flow in from the air inlet 154, flow through the first heat dissipation channel 13 and the second heat dissipation channel 14, and exchange heat with the first heat sink 123 and the second heat sink 124, ensuring the stable operation of the drive assembly 12.

[0026] The variable frequency drive assembly 16 is at least partially mounted above the drive assembly 12 and the intake assembly 15, and includes a housing 161, a heat sink 162, and an IGBT module 163. The IGBT module 163 is at least partially disposed at the bottom of the inner cavity of the housing 161. The heat sink 162 is mounted at the bottom of the housing 161, close to the IGBT module 163, and is at least partially disposed within the second heat dissipation channel 14. When cold air flows through the second heat dissipation channel 14, it can simultaneously exchange heat with the heat sink 162 and the second heat sink 124, improving the heat dissipation efficiency of the variable frequency drive assembly 16; at the same time, it reduces the need for an independent axial fan in the variable frequency drive assembly 16, reducing the power consumption and cost of the screw compressor; furthermore, this heat dissipation structure is highly compact, improving the space utilization of the screw compressor.

[0027] Through the above configuration, the screw compressor integrates the drive assembly 12, the intake assembly 15, and the variable frequency speed control assembly 16 into a single design, and optimizes the heat dissipation channel and assembly layout. This achieves integrated high-efficiency heat dissipation and high-performance drive, solving the problems of complex structure and low heat dissipation efficiency in traditional screw compressors, and improving the integration and operational reliability of the equipment. Furthermore, while traditional screw compressors use a motor air guide shroud for airflow guidance, the intake assembly 15 and drive assembly 12 are independently configured, with the air guide shroud 155 of the intake assembly 15 used for airflow guidance. This avoids air leakage and uneven airflow during heat exchange.

[0028] like Figure 1 As shown, the housing 161 includes an upper housing 1611, a lower housing 1612, a first sealing step surface 1613, and a second sealing step surface 1614. Specifically, the front ends of the upper housing 1611 and the lower housing 1612 are connected through the first sealing step surface 1613 to form a sealed structure. The rear ends of the upper housing 1611 and the lower housing 1612 are connected through the second sealing step surface 1614 to form a sealed structure. This prevents oil, water, dust, metal shavings, etc., from entering the frequency converter and damaging electrical components.

[0029] like Figures 2 to 3 As shown, the gap D1 between the first sealing step surface 1613 between the upper shell 1611 and the lower shell 1612 is less than or equal to 1 mm. The gap D2 between the second sealing step surface 1614 between the upper shell 1611 and the lower shell 1612 is less than or equal to 1 mm. With the above settings, the frequency converter has a high protection level, effectively preventing solid objects with a diameter greater than 1 mm from entering, and preventing splashing water droplets and dust from entering, making it suitable for applications in harsh environments.

[0030] The top of the upper shell 1611 is provided with a liquid crystal display driver board 1615, and the liquid crystal display driver board 1615 is covered with a display screen film 1616 to achieve waterproof and dustproof protection.

[0031] Specifically, the variable frequency drive assembly 16 also includes a rectifier module 165 and an inverter drive PCB board 166. The inverter drive PCB board 166 is at least partially disposed within the housing 161 and is connected to the IGBT module 163 via the rectifier module 165. During operation, current is inverted and rectified by the inverter drive PCB board 166 and the rectifier module 165 before reaching the IGBT module 163 to drive its operation. In this process, electrical energy is converted into heat energy, which is dissipated by the heat sink 162 within the second heat dissipation channel 14.

[0032] The variable frequency drive assembly 16 also includes a control module 167. The control module 167 is housed within the housing 161 and connected to the housing 161 via several support members. It is electrically connected to the inverter drive PCB board 166, the rectifier module 165, and the IGBT module 163. The connections between the control module 167, the inverter drive PCB board 166, the rectifier module 165, and the IGBT module 163 and the housing 161 are all waterproof and dustproof, providing better protection for the variable frequency drive.

[0033] More specifically, the lower housing 1612 is made of plastic, while the IGBT module 163 is made of metal. A hard-soft sealing structure is formed between the lower housing 1612 and the IGBT module 163 to prevent moisture and dust from entering the frequency converter assembly 16 from the drive assembly 12. At the same time, the hard-soft sealing structure reduces the need for additional sealing structures, thus reducing material costs. Furthermore, the hard-soft sealing structure can be replaced by deformation caused by mechanical vibration and thermal expansion, further improving the stability of the connection between the lower housing 1612 and the IGBT module 163.

[0034] Furthermore, a lead-out module 164 is provided at the rear end of the lower housing 1612. The lead-out module 164 includes a lead wire 1641 connecting the internal and external circuits of the frequency converter speed control component 16 and a sealing sleeve 1642 covering the lead wire 1641 to improve the sealing effect of the lead-out module 164. A sealing ring 1643 is provided at the connection between the sealing sleeve 1642 and the lower housing 1612, which is fitted on the sealing sleeve 1642 to improve the sealing effect at the connection between the lead-out module 164 and the lower housing 1612.

[0035] With the above-mentioned configuration, the assembly precision of the variable frequency drive assembly 16 is higher, and the protection level reaches IP54, which can prevent solid particles as small as 1mm from entering the housing 161. At the same time, waterproof and dustproof seals are provided between each electrical component inside the housing 161 and each contact surface of the housing 161, further improving the protection effect of the variable frequency drive assembly 16.

[0036] Furthermore, the drive motor 122 includes a first operating speed and a second operating speed. When the variable frequency drive assembly 16 is operating under rated load, the drive motor 122 is at the first operating speed. When the load of the air compression assembly 11 changes, and the operating loads of the rectifier module 165 and the IGBT module 163 change accordingly, the variable frequency drive assembly 16 controls the drive motor 122 to operate at the second operating speed. The ratio of the difference between the second operating speed and the first operating speed to the change in the operating load of the rectifier module 165 and the IGBT module 163 is the variation coefficient k. The variation coefficient k is determined based on the heat exchange efficiency and heat dissipation area of ​​the radiator 162. When the drive motor 122 is at the second operating speed, the airflow and air pressure of the cold air introduced by the intake assembly 15 can control the temperature of the variable frequency drive to a controllable optimal state.

[0037] like Figure 1 As shown, an air guide shroud 155 is provided above the air inlet 154, and an air guide plate 156 is provided at the bottom of the variable frequency speed control component 16 near the air guide shroud 155. An air guide channel 157 is formed between the air guide plate 156 and the air guide shroud 155. Cold air flows in from the air inlet 154, is guided by the air guide shroud 155, and forms air volume and air pressure in the cover 151. After secondary guidance by the air guide plate 156, it flows into the second heat dissipation channel 14 through the air guide channel 157. Through secondary guidance, the airflow direction and air pressure distribution can be optimized, reducing cold air leakage and improving the flow stability of cold air in the cover 151 and the second heat dissipation channel 14, thereby ensuring the heat dissipation efficiency of the drive component 12 and the variable frequency speed control component 16.

[0038] Specifically, the air inlet 154 is an air inlet louver window to prevent dust or impurities from entering the cover 151; at the same time, the direction of cold air introduction is optimized to ensure that cold air can flow into the cover 151 evenly and stably.

[0039] The above description of embodiments of the present invention, through which those skilled in the art are able to implement or use the present invention, will be readily apparent to those skilled in the art. Various modifications to these embodiments will be readily apparent to those skilled in the art. The general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novelty disclosed herein.

Claims

1. A highly protected screw compressor, characterized in that, include: An air compression assembly (11) is used to compress the input air; The drive assembly (12) is installed on the right side of the air compressor assembly (11) and is used to drive the air compressor assembly (11). The top is provided with a first heat dissipation channel (13) and the bottom is provided with a second heat dissipation channel (14). An air intake assembly (15) is installed on the right side of the drive assembly (12) and is connected to the first heat dissipation channel (13) and the second heat dissipation channel (14); A variable frequency speed control assembly (16) is at least partially mounted above the drive assembly (12) and the intake assembly (15), and includes a housing (161) and a radiator (162); the radiator (162) is mounted at the bottom of the housing (161) and is at least partially disposed in the second heat dissipation channel (14); the housing (161) includes an upper shell (1611), a lower shell (1612), a first sealing step surface (1613), and a second sealing step surface (1614); the upper shell (1611) and the lower shell (1612) are mounted at least partially disposed above the drive assembly (12) and the intake assembly (15), and the intake assembly (1612) is ... The front end of the shell (1612) is connected through the first sealing step surface (1613) to form a sealing structure; the rear ends of the upper shell (1611) and the lower shell (1612) are connected through the second sealing step surface (1614) to form a sealing structure; the gap D1 between the upper shell (1611) and the lower shell (1612) of the first sealing step surface (1613) is less than or equal to 1 mm; the gap D2 between the upper shell (1611) and the lower shell (1612) of the second sealing step surface (1614) is less than or equal to 1 mm.

2. The high-protection screw compressor as described in claim 1, characterized in that, The drive assembly (12) includes a motor cylinder (121), a drive motor (122), a first heat sink (123), and a second heat sink (124). The drive motor (122) is at least partially disposed inside the motor cylinder (121) and connected to the air compression assembly (11). The first heat sink (123) is disposed at the bottom of the motor cylinder (121), close to the drive motor (122), and at least partially disposed inside the first heat dissipation channel (13). The second heat sink (124) is disposed at the top of the motor cylinder (121), close to the drive motor (122), and at least partially disposed inside the second heat dissipation channel (14).

3. The high-protection screw compressor as described in claim 2, characterized in that, The air intake assembly (15) includes a cover (151), a rotating shaft (152), and a centrifugal impeller (153). The cover (151) is installed on the right side of the motor cylinder (121), and an air inlet (154) is provided at the right end. The centrifugal impeller (153) is at least partially disposed inside the cover (151). The rotating shaft (152) extends in the left-right direction, is connected to the centrifugal impeller (153), passes through the motor cylinder (121), and is connected to the drive motor (122). The drive motor (122) can drive the centrifugal impeller (153) to rotate through the rotating shaft (152). The first heat dissipation channel (13) and the second heat dissipation channel (14) are both connected to the interior of the cover (151).

4. The high-protection screw compressor as described in claim 3, characterized in that, An air guide shroud (155) is provided above the air inlet (154), and an air guide plate (156) is provided at the bottom of the variable frequency speed control component (16) near the air guide shroud (155). An air guide channel (157) is formed between the air guide plate (156) and the air guide shroud (155). Air can flow into the cover (151) from the air inlet (154), be guided by the air guide shroud (155) and the air guide plate (156), and flow into the second heat dissipation channel (14) from the air guide channel (157).

5. The high-protection screw compressor as described in claim 2, characterized in that, The variable frequency speed control component (16) also includes an IGBT module (163); the IGBT module (163) is at least partially disposed at the bottom of the inner cavity of the housing (161); the heat sink (162) is installed at the bottom of the housing (161), close to the IGBT module (163), and is at least partially disposed in the second heat dissipation channel (14).

6. The high-protection screw compressor as described in claim 5, characterized in that, The lower shell (1612) is made of plastic, and the IGBT module (163) is made of metal. A hard-soft sealing structure is formed between the lower shell (1612) and the IGBT module (163) to prevent moisture and dust from entering the variable frequency speed control component (16) from the drive component (12).

7. The high-protection screw compressor as described in claim 5, characterized in that, The lower housing (1612) has a lead-out module (164) at its rear end; the lead-out module (164) includes a lead-out wire (1641) that connects the internal and external circuits of the variable frequency speed control component (16) and a sealing sleeve (1642) that covers the lead-out wire (1641); a sealing ring (1643) is provided at the connection between the sealing sleeve (1642) and the lower housing (1612).

8. The high-protection screw compressor as described in claim 5, characterized in that, The top of the upper shell (1611) is provided with a liquid crystal display driver board (1615), and the liquid crystal display driver board (1615) is covered with a display screen film (1616).

9. The high-protection screw compressor as described in claim 5, characterized in that, The variable frequency speed control component (16) also includes a rectifier module (165) and an inverter drive PCB board (166); the inverter drive PCB board (166) is at least partially disposed in the housing (161) and is connected to the IGBT module (163) through the rectifier module (165).

10. The high-protection screw compressor as described in claim 9, characterized in that, The drive motor (122) includes a first operating speed and a second operating speed; when the variable frequency speed control component (16) is operating under rated load, the drive motor (122) is at the first operating speed; when the load of the air compression component (11) changes, and the operating load of the rectifier module (165) and the IGBT module (163) changes accordingly, the variable frequency speed control component (16) controls the drive motor (122) to be at the second operating speed; the ratio of the difference between the second operating speed and the first operating speed to the change in the operating load of the rectifier module (165) and the IGBT module (163) is the change coefficient k.

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